Saw-tab



Ntra STATES LAWRISTON R. BEURMANN, OF EAST SAGINAW, MICHIGAN.

SAW-TAB.

SPECIFICATION forming part of Letters Patent No. 311,170, dated January 27, 1885.

Application filed July 5, 1884. (No model.)

'To all whom t may concern..-

Be it known that I, LAwRIsroN R. BEUR- MANN, of East Saginaw, county of Saginaw, State of Michigan, have invented a new and useful Improvement in Saws and Tabs; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form a part of this specification.

My invention consists in the combination of devices and appliances, hereinafter specified, and more particularly pointed out in thc claims.

In the drawings, Figure 1 is a side elevation of a saw-blade embodying features of my invention. Fig. 2 is'a similaryiew showing the tabs engaged threwith. Fig. 3 is asimilar view showing the tabs in section, Fig. 4 is a separate view of the upper tab in section. Fig. 5 is a view of the lower tab in section. Fig. 6 is a cross-section of the blade, showing the tenons of the one portion engaged with the shoulders of the other.

My invention relates to saws and tabs, and is more particularly designed to facilitate the removal of the saw from the hangers in gangsaw mills when the saw becomes dull, and also to facilitate its replacement with a sharpened saw. This 1 accomplish in the manner and by the means hereinafter described and claimed, reference being made to the-drawings, where A is the rear portion of the sawblade, and A is the front or cutting portion of the blade. I prefer to provide one of the sections with a series of V-shaped shoulders, a, and the other portion with a series of corresponding sockets, a', to facilitate a firm union of the sections, and to prevent the lateral motion of two portions of the blade independ ent of each other. I would have it understood, however, that I do not limit myself to l the shoulders of the tabs may beentered into said recesses. Said recesses are also extended to one side ofthe open end of the same, so as to permit the blade beinglocked in the tab by sliding the blade, so that the shoulders of the tab will engage in the side extensions of said recesses.

I do not limit myself to the precise form of the recesses shown in the drawings, as I contemplate anysuitable angular recesses whereby the shoulders of the tab may be entered readily into their open ends, and the saws then moved forward or backward,so as to engage the shoulders of the tab in the angular extension of said recesses, to hold the blade from displacement. The removal ofthe cutting portion of the blade will also be facilita-ted by cutting off the inner corners adjacent to the recesses, as shown in Figs. l and 3.

B and C are my improved tabs.

Hitherto tabs as commonly constructed have been made in separable parts, the one part adapted for engagement with the blade, the other part Vbeing then riveted or held in place by screws. I prefer, however, to construct my improved tabs in one integral piece, dispensing thus with the necessity of securing one of the faces in place after the saw is engaged with the tab.

As illustrated in the drawings, the tab Bis adapted for engagement with the upper portion of the plate and the tab C with the lower portion of the plate. 'The tab B is constructed with'an orifice, b, and socket b', adapted to receive the corresponding upper end of the rear section of the blade, said upper section of the rear portion of the blade recessed or cut away, as shown at A2 and A3. Said tab is also recessed, as shown at b2, for the reception of the upper end of the front portion of the blade, and provided with a shoulder, b3. The tab C is provided with a series of shoulders, c c c2 e3, adapted to enter the recesses in the lower ends of the blade, the recess a4 communicating with the rear edge of the blade, and the otherv recesses communicating with the lower edge or end of the blade.

The operation of the device is as follows: The rear portion of the blade is engaged in place in thev tabs by entering the shoulders of the tabs into the recesses of the blade, and

then forcing the blade in the direction to en- IOC gage said shoulders under the angular eXtensions. The upper end of the rear section is pivotally engaged with the upper tab by inserting a rivet or screw through the orifices a of the blade and b ofthe tab. The front portion of the blade is also engaged with the talos by entering the shoulders b and c3 into the corresponding recesses of the blade through the open ends of said recesses, when the blade may be forced back against the rear portion ot' the blade so that the shoulders of the tab will come under the angular extension of the recesses, as shown in Fig. 3. By pivotally connecting the`V upper end of the rear portion of the blade with the tab the operation of engaging the front portion ot' the blade may be i'acilitated, as this pivotal connection permits the forward end ot' the upper tab to be tilted for this purpose, this pivotal connection also equalizing the tension when applied to the two sections of the blade. This pivotal connection I regard as a matterot great convenience and importance where the blade is constructed in two sections, and forms an essential feature of my invention. I would have it understood, moreover, that I do not limit myself to the use of my improved tabs with blades constructed in two sections, as they may be employed with an integral blade. It is obvious, however, that by constructing the blade as shown in the drawings, with a removable cutting-edge, the labor of removing and replacing the saw when dull is lessened, as the cutting-ed ge alone needs to be removed and replaced for sharpening; or, should it be entirely outworn, it alone may be replaced with a new cutting-edge, the remainder of the blade remaining. Thus the rear portion, constituting the heavier part of the blade, will ontlast several cutting-edges, thus securing great economy in the construction of the saw-blades.

Instead of engaging the front portion of the blade with the tabs in the manner shown, the tab may be constructed with a groove, B and C, and the front section of the blade with recesses A* and A5, said recesses and grooves adapted to receive a link, D and D.

It is obvious that when the tabs are engaged with the blades, and tension is applied to said tabs, as is the case in gang-saws, the location of the shoulders of the tabs in the angular ends ofthe recesses ofthe blade will effectually prevent any possibility of the disengagement of the blade with the tabs, especially as I prefer to curve the angular ends of said recesses, as shown, to receive the shoulders of the tabs.

The links D and D may be employed in connection with the other means shown and described for engaging the front portion of the blade with the tabs, thus holding thefront portion of the blade more iirmly in engagement with the tabs.

I would have it understood that Idesign to engage the front portions of the blade with the tabs, either with or with out the links and the other means herein specied,either separately or conj ointly, or they may be entirely dispensed with. If the links are used,they are adjusted in place over the corresponding notches in the tabs and blades before the tension is applied.

I do not limit myself to any definite number of shouldersiu the tabs or corresponding recesses on the extremities of the blade, nor to the speciiic form ot' said shoulders and recesses.

I do not limit myself to the use of the lower tab in that location, as it -is evident that with an integral blade the same may be used at both ends ot' the blade.

I am aware that tabs made in an integral piece have been constructed, but without interior shoulders and sockets to engage with corresponding sockets and tenons upon the ends ot' the saw-blade, the saine having to be riveted upon the saw-blade, in which case the blade is notremovable. In my improved tab, however, no rivets are needed for the purpose of securing thesame upon the blade, except iu case of the upper tab, to permit of its being tilted, if desired, the shoulders in the tabs serving to hold the blade in connection therewith, and to prevent the sides of the tab from spreading when tension is applied. I prefer, also, to construct the sockets a upon the front portion of the blade longer than the tenons c, as it is necessary that the cutting-blade must work freely upon the back blade in connecting the two together and in disconnecting them. This construction will prevent their binding at these points.

I claiml. The combination, with a saw-blade having open-ended recesses at its extremities, ofa slotted saw-tab composed of a single piece, having interior transverse shoulders for engaging and disengaging the recesses ofthe sawblade, substantially as described.

2. The combination, with a saw-blade composed of two parts each having its extremities provided with open-ended recesses, of a saw-tab having interior transverse shoulders for detachably engaging the end recesses of the saw-blade, substantially as described.

' 3. The combination, with a saw-blade composed ot' two parts, of a saw-tab pivotally connected with one of said parts and detachably engaged with the other part, substantially as described.

4. The combination, with a saw-blade composed of two parts, one having an open-ended recess at its extremity, of a lsaw-tab pivotally connected with the extremity of the other part of the saw-blade, and having a shoulder to detachably engage the open-ended recess, substantially as described.

5. The combination, with a saw-blade having two parts, one having an open-ended recess at its extremity, of the saw-tab formed in a single piece, and having the recesses bb?, shoulder b", and pivot connecting the tab with one part of the blade, so that its shoulder may be detachably engaged with the open-ended slot of the other part of the blade, substantially as described.

IOO

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6. The combination of a saw-blade composed of two parts removably connected at` their adjacent edges, with end tabs detachably connecting the extremities of the two parts ofthe blade, substantially as described.

7. A saw-blade composed of two parts the adjacent edges of which are provided, respectively, with V-shaped shoulders and tenons, with end tabs detachably connecting the eX- tremities of the two parts of the blade, substantially as described.

8. The combination, with a saw-blade constructed of a rear section and a front cut ting-section, of tabs engaging the extremities of said sections, one of said tabs having a pivotal connection with the rear portion of the blade, andthe front section of the blade being removably engaged with said tabs, substantially as described.

9. The combination, with the saw-blade constructed in a rear section and a front cutting-section, of tabs engaging the ends of said blades, one of said tabs having a pivoted connection with the rear portion of the blade, and in addition thereto links D and D', to engage the cutting-edge of the blade with the tab, substantially as described.

In testimony whereof I sign this specifica` tion in the presence of two witnesses.

LAWRISTON R. BEURMANN.

Witnesses:

ADoLPH NV. DELFs, WILLIAM E. GARDINER. 

